Perhaps you should try some spelling variations:
"based computational using diffusion problem" » "and computational using diffusion problem" (Expand search), "by computational using diffusion problem" (Expand search), "based computation using diffusion problem" (Expand search), "based computations using diffusion problem" (Expand search), "based computacional usinas diffusion problem" (Expand search), "based computational using diffusion process" (Expand search)
"using total python python programming" » "using total pythons python programming" (Expand search), "using total piton python programming" (Expand search), "using total pitons python programming" (Expand search), "using tool python python programming" (Expand search)

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("based computational using diffusion problem") OR ("using total python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"based computational using diffusion problem\") OR (\"using total python python programming\"))".
• Removing quotes may allow a broader search: (( based computational using diffusion problem ) OR ( using total python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("based computational using diffusion problem") OR ("using total python python programming"))*.